// This example shows how to register and unregister multiple nodes in an OPC UA server, and use this approach together with
// connection locking.
//
// Node registration (with OPC UA servers that support it) can improve performance with repeatedly accessed nodes.

using System;
using Microsoft.Extensions.DependencyInjection;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;
using OpcLabs.EasyOpc.UA.Services;
using OpcLabs.EasyOpc.UA.Services.Extensions;

namespace UADocExamples._EasyUAClientNodeRegistration
{
    class RegisterAndUnregisterMultipleNodes
    {
        public static void Main1()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            // Instantiate the client object.
            using (var client = new EasyUAClient())
            {
                // Obtain the client node registration service.
                IEasyUAClientNodeRegistration clientNodeRegistration = client.GetRequiredService<IEasyUAClientNodeRegistration>();

                // Obtain the client connection control service.
                IEasyUAClientConnectionControl clientConnectionControl = client.GetRequiredService<IEasyUAClientConnectionControl>();

                var nodeDescriptorArray = new UANodeDescriptor[]
                {
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[0]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[4]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[8]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[12]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[16]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[20]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[24]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[28]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[32]",
                    "nsu=http://samples.org/UA/memorybuffer/Instance ;ns=8;s=UInt32[36]"
                };

                Console.WriteLine("Registering nodes");
                int[] registrationHandleArray = clientNodeRegistration.RegisterMultipleNodes(endpointDescriptor, nodeDescriptorArray);

                Console.WriteLine("Locking the connection");
                // Locking the connection will attempt to open it, and when successful, the nodes will be registered with
                // the server at that time. The use of locking is not necessary, but it may bring benefits together with the
                // node registration. See the conceptual documentation for more information.
                int lockHandle = clientConnectionControl.LockConnection(endpointDescriptor);

                Console.WriteLine("Waiting for 10 seconds...");
                // The example uses this delay to demonstrate the fact that your code might have other tasks to do, before
                // it accesses the previously registered nodes.
                System.Threading.Thread.Sleep(10 * 1000);

                Console.WriteLine("Reading (1)");
                UAAttributeDataResult[] resultArray1 = client.ReadMultiple(endpointDescriptor, nodeDescriptorArray);
                foreach (UAAttributeDataResult result in resultArray1)
                    Console.WriteLine(result);

                Console.WriteLine("Reading (2)");
                UAAttributeDataResult[] resultArray2 = client.ReadMultiple(endpointDescriptor, nodeDescriptorArray);
                foreach (UAAttributeDataResult result in resultArray2)
                    Console.WriteLine(result);

                Console.WriteLine("Unlocking the connection");
                clientConnectionControl.UnlockConnection(lockHandle);

                Console.WriteLine("Unregistering nodes");
                clientNodeRegistration.UnregisterMultipleNodes(registrationHandleArray);

                Console.WriteLine("Finished.");
            }
        }
    }
}